مثال

بررسی اینکه آیا مقدار ورودی NaN است یا نه:

# Import math Library
import math 

# Check whether some values are NaN  or not
print (math.isnan (56))
print  (math.isnan (-45.34))
print (math.isnan (+45.34))
print (math.isnan  (math.inf))
print (math.isnan (float("nan")))
print (math.isnan  (float("inf")))
print (math.isnan (float("-inf")))
print (math.isnan  (math.nan))